/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include <assert.h>

#include "uv.h"
#include "internal.h"
#include "atomicops-inl.h"
#include "handle-inl.h"
#include "req-inl.h"

void uv_async_endgame(uv_loop_t* loop, uv_async_t* handle)
{
    if (handle->flags & UV__HANDLE_CLOSING && !handle->async_sent) {
        assert(!(handle->flags & UV_HANDLE_CLOSED));
        uv__handle_close(handle);
    }
}

int uv_async_init(uv_loop_t* loop, uv_async_t* handle, uv_async_cb async_cb)
{
    uv_req_t* req;

    uv__handle_init(loop, (uv_handle_t*)handle, UV_ASYNC);
    handle->async_sent = 0;
    handle->async_cb = async_cb;

    req = &handle->async_req;
    uv_req_init(loop, req);
    req->type = UV_WAKEUP;
    req->data = handle;

    uv__handle_start(handle);

    return 0;
}

void uv_async_close(uv_loop_t* loop, uv_async_t* handle)
{
    if (!((uv_async_t*)handle)->async_sent) {
        uv_want_endgame(loop, (uv_handle_t*)handle);
    }

    uv__handle_closing(handle);
}

int uv_async_send(uv_async_t* handle)
{
    uv_loop_t* loop = handle->loop;

    if (handle->type != UV_ASYNC) {
        /* Can't set errno because that's not thread-safe. */
        return -1;
    }

    /* The user should make sure never to call uv_async_send to a closing */
    /* or closed handle. */
    assert(!(handle->flags & UV__HANDLE_CLOSING));

    struct uv_req_s* req = (void*)malloc(sizeof(*req));
    uv_req_init(loop, req);
    req->type = UV_WAKEUP;
    req->data = handle;

    //if (!uv__atomic_exchange_set(&handle->async_sent)) {
    POST_COMPLETION_FOR_REQ(loop, req);
    //}

    return 0;
}

void uv_process_async_wakeup_req(uv_loop_t* loop, uv_async_t* handle,
    uv_req_t* req)
{
    assert(handle->type == UV_ASYNC);
    assert(req->type == UV_WAKEUP);

    handle->async_sent = 0;

    if (handle->flags & UV__HANDLE_CLOSING) {
        uv_want_endgame(loop, (uv_handle_t*)handle);
    } else if (handle->async_cb != NULL) {
        handle->async_cb(handle);
    }
    free(req);
}
